본문

서브메뉴

Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202104653
ISBN  
9798290909615
DDC  
616.079
저자명  
Dahlquist, Korbyn Joy Vera.
서명/저자  
Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
발행사항  
[Sl] : University of Minnesota, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
164 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Camell, Christina D.
학위논문주기  
Thesis (Ph.D.)--University of Minnesota, 2025.
초록/해제  
요약Aging is associated with a decline in immune function, increasing susceptibility to infections, and reducing the efficacy of immunotherapies. This dissertation investigates the mechanisms driving CD8+ T cell dysfunction during aging, focusing on T cell exhaustion and immunosenescence during infection. Using mouse models, I examined how programmed cell death protein 1 (PD1) blockade affects CD8+ T cells in aged mice exposed to lethal microbial exposure (NME). I demonstrate that infection exacerbates CD8+ T cell exhaustion in aged mice, with increased expression of inhibitory receptors (PD1) and diminished effector function. PD1 checkpoint blockade improved survival in old mice by enhancing CD8+ T cell cytotoxic capacity, without increasing inflammation. To further characterize functional capacity, I validated an in vivo assay to assess degranulation (cytotoxicity) in old mice. Using this approach, I found that CD8+ T cells from old mice retain the ability to degranulate in vivo upon aCD3 stimulation, but not during LCMV-Armstrong or Cohousing (CoH or NME). Finally, I explored how the duration and timing of antigen exposure and cytokines, such as interleukin-10 (IL-10), alter CD8+ T cell exhaustion. I determined that long-term NME exposure reduces inflammatory cytokine gene expression and the frequency of CD8+ CD44+ PD1+ T cells. Additionally, IL-10 neutralization ablates the protective effects of anti-PD1 during NME challenge. Together, these studies provide mechanistic insight into how age and environmental challenges impair CD8+ T cell function. My findings reveal potential therapeutic strategies to restore CD8+ T cell function and resilience in aged individuals.
일반주제명  
Immunology
일반주제명  
Aging
일반주제명  
Molecular biology
일반주제명  
Cellular biology
일반주제명  
Oncology
키워드  
CD8+ T cells
키워드  
Cytotoxicity
키워드  
Immune checkpoint blockade
키워드  
Infections
키워드  
Inflammation
키워드  
Cell function
기타저자  
University of Minnesota Biochemistry Molecular Bio and Biophysics
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008260126s2025        us                              c    eng  d
■001000017358385
■00520260202104653
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798290909615
■035    ▼a(MiAaPQ)AAI32115612
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616.079
■1001  ▼aDahlquist,  Korbyn  Joy  Vera.
■24510▼aCytotoxicity,  Exhaustion,  and  Immunosenescence  in  CD8+  T  Cells  During  Aging  and  Infection
■260    ▼a[Sl]▼bUniversity  of  Minnesota▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a164  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Camell,  Christina  D.
■5021  ▼aThesis  (Ph.D.)--University  of  Minnesota,  2025.
■520    ▼aAging  is  associated  with  a  decline  in  immune  function,  increasing  susceptibility  to  infections,  and  reducing  the  efficacy  of  immunotherapies.  This  dissertation  investigates  the  mechanisms  driving  CD8+  T  cell  dysfunction  during  aging,  focusing  on  T  cell  exhaustion  and  immunosenescence  during  infection.  Using  mouse  models,  I  examined  how  programmed  cell  death  protein  1  (PD1)  blockade  affects  CD8+  T  cells  in  aged  mice  exposed  to  lethal  microbial  exposure  (NME).  I  demonstrate  that  infection  exacerbates  CD8+  T  cell  exhaustion  in  aged  mice,  with  increased  expression  of  inhibitory  receptors  (PD1)  and  diminished  effector  function.  PD1  checkpoint  blockade  improved  survival  in  old  mice  by  enhancing  CD8+  T  cell  cytotoxic  capacity,  without  increasing  inflammation.  To  further  characterize  functional  capacity,  I  validated  an  in  vivo  assay  to  assess  degranulation  (cytotoxicity)  in  old  mice.  Using  this  approach,  I  found  that  CD8+  T  cells  from  old  mice  retain  the  ability  to  degranulate  in  vivo  upon  aCD3  stimulation,  but  not  during  LCMV-Armstrong  or  Cohousing  (CoH  or  NME).  Finally,  I  explored  how  the  duration  and  timing  of  antigen  exposure  and  cytokines,  such  as  interleukin-10  (IL-10),  alter  CD8+  T  cell  exhaustion.  I  determined  that  long-term  NME  exposure  reduces  inflammatory  cytokine  gene  expression  and  the  frequency  of  CD8+  CD44+  PD1+  T  cells.  Additionally,  IL-10  neutralization  ablates  the  protective  effects  of  anti-PD1  during  NME  challenge.  Together,  these  studies  provide  mechanistic  insight  into  how  age  and  environmental  challenges  impair  CD8+  T  cell  function.  My  findings  reveal  potential  therapeutic  strategies  to  restore  CD8+  T  cell  function  and  resilience  in  aged  individuals.
■590    ▼aSchool  code:  0130.
■650  4▼aImmunology
■650  4▼aAging
■650  4▼aMolecular  biology
■650  4▼aCellular  biology
■650  4▼aOncology
■653    ▼aCD8+  T  cells
■653    ▼aCytotoxicity
■653    ▼aImmune  checkpoint  blockade
■653    ▼aInfections
■653    ▼aInflammation
■653    ▼aCell  function
■690    ▼a0982
■690    ▼a0493
■690    ▼a0307
■690    ▼a0379
■690    ▼a0992
■71020▼aUniversity  of  Minnesota▼bBiochemistry,  Molecular  Bio,  and  Biophysics.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0130
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358385▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

Preview

Export

ChatGPT Discussion

AI Recommended Related Books


    New Books MORE
    Statistics for the past 3 years. Go to brief

    Подробнее информация.

    • Бронирование
    • не существует
    • моя папка
    • Первый запрос зрения
    • Non-Book Loan Application
    • Nighttime Book Loan Application
    материал
    Reg No. Количество платежных Местоположение статус Ленд информации
    TF15581 전자도서 대출가능 My Folder 부재도서신고 비도서대출신청 야간 도서대출신청

    * Бронирование доступны в заимствований книги. Чтобы сделать предварительный заказ, пожалуйста, нажмите кнопку бронирование

    Books borrowed together with this book

    Related Popular Books

    Available after logging in.